I was running Motorcraft 15w40 in my 2004 F250 6.0L and I recently switched over to Rotella T5 10w30. Can I go back to using motorcraft 15w40. Because I posted a thread about a burning oil smell while sitting still that was coming through the a/c vents, also smelled it standing next to it. I checked everything except the turbo, Im not leaking anything on the pavement and the dipstick shows the same everytime I check it. It started right after I switched to the rotella. So can I go back to Motorcraft. Thanks for all the help.

you can run saw dust through it if you really want to, all joking aside..... i would highly not suggest going back to the motorcraft oil. Maybe try 8oz of Rev X oil aditive and see if it cures your problem. Maybe it was some bad oil or something, because a lot of people are running this oil including me with zero issues. I say give it a little while depending how long you've had the oil in there. These trucks are sensitive to what oil is used in them; let it work through the system and see where it gets you

I'm not a mechanical engineer, but I can't figure out how the viscosity of oil would have anything to do with a burning oil smell. What you are smelling could be from oil change spillage, an oil leak from the CAC boots, a power steering leak, a trans or trans cooler line leak, a transfer case leak, front or rear pinion seal leak (getting flung onto the hot exhaust).

A small underhood burning might completely burn off by the time the truck has fully warmed up. Start it and drive it for only about 5 minutes, shut it off. pop the hood and try to tract the smell or even smoke, if there is any.

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